Reversing mechanism for compound engines.



No. 333,337. l

` `REVERSING .MGHANISM FOR COMP -APPLIoATroN lm0100012 no.

OUND ENGINES.

' PATENTBD 00123, 1900..

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No. 833.937. y l PATENTED 00T. 2s, 1906.

- G.' B. PETSCHE.

REVERSING MEGHANISM FOR COMPOUND ENGINES.

APPLIUATION FILED oel-.2o. 1905. v `4 SHEETS-snm s.

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PATENTED 0013.23, 1906. G. B. PETSGHE.

ANISM PoR coMPoUND REVERS-ING MECH EIIGINES.`

` APPLICATION FILED 00120, 1905.`

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, WIT/IESSES UNITED sTATEs .PATENT oEEioE.

GUSIAV BERNHARD PETSCHE, PHILADELPHIA, PENNSYLVANIA, ASSIGN OR TO THE SOUTHWARK FOUN DRY & .MACHINE COMPANY, OFPHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENN SYLVAN IA.

f-BEVERSING MEGHANISM Eon CoMPouND ENGINES..

Specication of Letters Patent.

Patented oct. 2s, '1906.

Application led October 20,1905. Serial No. 286;,579.

To all whom t may concern,.-

Be it known that I, GUsTAv BERNHARD PETsoHE, a subject of the German Emperor, residing in the city and county of Philadelphia, in the State of Pennsylvania, have invented a certain new and. useful Improvement in Reversing Mechanism for Compound Engines, of which the following is a true and exact description, reference being had to the accom anying drawings, which form' a part thereof My invention relates `to compound engines, and particularly tothe class of engines known as compound reversing-engines, vand used in rolling-mills'.

The object of my invention is to provide an engine of this kind with improved mechanijsm for actuating the valves to reverse the i engine, andparticularly with simple and eilicient reversing mechanism which will permit of an independent adjustment of the cut-off for either-the high or low pressure cylinders.

The leading feature of my invention consists in combining with a positively-actuated device for giving motion to the valves, and generally o the character known as a valvelinkjadjustable devices or link-blocksdirec'tlyconnec'ted with the valves, means for shifting said blocks simultaneously to effect the reversal of the engine, and means for shifting'or adjusting said blocks independen'tly, so as to regulate the cut-off with regard to either the-high or low pressure cylinders independently. f

A further improved feature of my .invention consists in providing adjustable stops for regulating the extent of movement of the link-blocks inreversing the engine.

Other features of my invention will best be understood as described in connection with V the drawings, which illustrate a reversingengine provided with my improvements, and

through the power-reversing mechanism, as on the line 4 4 of Fig. 5. Fig. 5 is acrosssection on the line 5 5 of Fig. 4. Fig. 6 is a lperspective view of the valve-link, together with the link-,blocks and mechanism for moving and adjusting these blocks. Figs. 7, and 8 are perspective views from different angles, -showing the construction of the link-blocks; and Fig.. 9 is a longitudinal section through link N and the clamping-slide secured to it. A and B are respectively the low and-high pressure cylinders of the engine. A is the pi ston-rod of the low-pressure cylinder, yto which is attached the piston A2, coupled through the cross-head with the connecting-rod C, coupled in turn to Athe crank C? on the engine-shaft B. The rod A is coupled, as shown in Fig. 3 with the pistonrod B of the high-pressure cylinder.

E E are parallel eccentrics secured on the shaft B on opposite sides of the angularly-set eccentric F, the eccentrics E being connected f by the rods E E with the lug G at the top-of the valve-link G, while the eccentric F is coupled by the rod F with the lugs G2 G2 at the bottom of thelink. The link G is provided with the slideways G3 and G4 and with the laterally extending trunnions G5 G5, which are supported on the rock-levers H H,

.pivoted on the shaft K, which is suitably supported on the frame of the engine.

I and J are link-blocks moving in the slide- Eways G3 and G4, block I being connected, through the rod I and rock-lever I2,with the "valve I3 of the low-pressure cylinder, the

necting-rod J and rock-lever J to ythe rod J 3,

{which iny turn connects through. the rocklever J 4 with the valve-rod J 5.

y L and M are levers pivoted'on the shaft K Y*and connected, through the rods L2 and M2, ,with the link-blocks J and I. IThe leversL and M are counterweighted, as shown. at L 1 and M, and provided with angular'lever-arms z L3 and M3, which are connected, through the rods L4 and M4 and the clamping-blocks, (in-l. g dicated at Land M5,) with the slotted reversing-levers, (indicated at N and N,) these IOO levers extendingparallel to each .other from j,

the rock-shaft O, to which they are secured and from the upper side of which extends the lever-arm O connected, through the rods O2 O2, with the cross-head P3 ofthe power reversing mechanism, which consists, as shown, of the cylinder P, having Working in it a piston P, connected by the piston-rod P2 with the cross-head P3, from which cross-head extends the rod P4, Which may properly be a continuation of the rod I2 and to the end of which is attached the plunger P5. This plunger works between the adjustable heads ,R andA R each formed with a cylindrical cavity adapted to receive the plunger P5 and each by preference furnished with a ventcock, as indicated at R8, to enable air to escape from the bottoms of the cylindrical cavities, which serve the purpose of dashots.

p The stop-blocks are held in position and adjusted by means of the right and left threaded screw-rods R2 R2, held in position on the framing R4 by means of heads, as indicated at R3 R3 in Fig. 4. Each of the threaded rods has attached to it a wormwheel, as indicated at R5 R5, and the rods are turned by the worms R7 R7, seeured'to the vertical shaft R6 and engaged with the Wormwheels, as shown in Fig. 5.

Q is the valve regulating the admission to the cylinder P and actuated through the rod Q by a mechanism not shown.

S indicates the high-pressure steam-main connecting with the high-pressure cylinder, and S is the low-pressure steam-receiver connecting the exhaust of the high-pressure cylinder with the low-pressure cylinder.

The oscillating motion of the link G is imparted, throughthe link-blocks I .and J and the connections described, to the valves ofthe high and low pressure cylinders, and when it is desired to reverse the engine it is only necessary that the link-blocks should be shifted in the link from a position on one side of its trunnion-pivots G5 to a position on the other side of said pivots. Obviously the cut-ofi of either valve can be regulated by adjusting the link-block by which it is actuated to a greater or less distance Jfrom the pivot of the link.

In my engine the reversal of the link-blocks is effected by causing the reversing-levers N N to oscillate, their motion being communicated through the connecting-rods L4 M4 to the levers L L3 and M M3 and through the connecting-rods L2 M2 to the link-blocks, which are caused to move from the position they occupy onone side of the pivot of the link to exactly corresponding positions on the other side of the ivot. The independent adjustment of the ink-blocks Jfor the purpose of regulating the cut-ofi ofthe controlled valve is effected in the structure shown b adjusting the clam ing sides L5 or M5 in the slotted reversal lin s N or N', and it will be seen that by this general arrangement it is practicable to independently adjust the cuto'li Jfor either cylinder and to preserve this adjustment when the engine is reversed. In Fig. 9 I have shown a practicable construction for adjusting the clamping-slide in the links N or N, but of course any convenient equivalent device may be used. My construction also enables me to regulate the valve throw and cut-0H of both valves by varying the oscillatory movements of the reversing-levers, which in the construction shown I do by providing the adjustable stopblocks R R, having moving between them the stop-plunger P5, connected directly with the piston P, as described, and by means of which the travel of the piston in the actuating-cylinder P is limited.

The importance of the dash-pot cylinders in the stop-blocks is of course obvious, in that it prevents injurious and destructive blows on the stop-blocks, and the described mechanism for adjusting the stop-blocks, including the threaded rods R2, the wormwheels, worms, and actuating-shaft, is obviously a simple and eHicient mechanism for accomplishing the desired purpose.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a compound engine, reversing mechanism, comprising means positively actuated by a moving part of the engine for actuating the valves, means adjustably connected to said positively-actuated device and directly connected to the valves, reversing mechanism to which both of said adjustable devices are connected and through which they are connected together and means `for independently adjusting said devices to vary the cut-oir of either the high or low pressure valv'es.

2. In a compound engine, reversing mechanism comprising means positively actuated. by a moving part of the engine for actuating the valves, means adjustably connected to said positively-actuated device and directly connected to the valves, reversing mechanism to which both of said adjustable devices are connected and through which they are connected together, adjustable stops for regulating the extent of movement of the adjustable valve actuating devices in reversing the engine, and means for independently adjusting said devices to vary the cutoff of either the high or low pressure valves.

3. In a compound engine, reversing meehanism comprising an oscillating valve-actuating link operated by a moving part of the engine, in combination with independent link-blocks, slidingly secured to said link, and connected one with the valve of' the high-pressure cylinder and the other with the valve of the low-pressure cylinder synchronously oscillating reversing-levers for IOO IOS

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shifting the link-blocks to reverse the engine, and connections from the link-blocks to the reversing-levers radially adjustable along said levers to vary the cut-oii of the valves.

4.. In a compound engine, reversing'mech- `anism comprising an oscillating valve-actuating link operated bya moving part of the en ine, in combination with independent lin -blocks, slidingly secured to said linkand connected one with the valve of the high-pressure cylinder and the other with the valve of the low-pressure cylinder synchronously oscillating reversing-levers for shifting the link-blocks to reverse the engine, connections from the link-blocks to the reversing -levers radially adjustable along said levers to vary the cut-off of the valves,

radially adjustable along said levers to vary the cut-off of the valves, power mechanism for oscillating the reversing-levers, .and adjustable dash-pots acting as stops for regulating the extent oi their movements.

6. In a compound engine, reversing mechanism comprising an oscillating valve-actuating link operated by a moving part of the 'engine in combination with. inde endent linkblocks, sliding] secured to said ink and connected one wit the valve of the high-pressure cylinder and the other with the valve of the low-pressure cylinder synchronously oscillating reversing-levers for shifting the linkblocks to reverse the engine, connections from the link-blocks to the reversing-levers radially adjustable along said levers to vary the cut-ofi of the valves, power mechanism i for .oscillating the reversing-levers, and adlbetween which the justable stops for regulating the extent oi' their movements, a cylinder and piston for oscillating the reversing-levers, a plunger moving with said piston, two movable heads having dash-pot cylinders formed in them plunger moves', and means for moving said heads vtoward and from each other to vary the movements of the plunger and parts connected thereto.

7. In a compound engine, reversing mechanism comprisingan oscillating valve-actuating link operated byja moving part of the engine combination with inde endent linkf 1 blocks, slidingly secured to said ink and connected one with'- the valve of the high-pressure cylinder and the other with the valve of the low-pressure c linder synchronously oscillating reversing-l7 blocks to reverse .the engine, connections from the link-blocks to the reversing-levers radially adjustable along said levers to vary the cut-off of the valves, power mechanism evers for shifting the linkfor oscillating the reversing-levers, and adjustable stops for regulatingthe extent of vtheir movements, a cylinder and piston for oscillating the reversing-levers, a plunger moving with said piston, two movable heads having dashot cylinders formed in them, y

between whic the plunger moves, rods R2, R2, having right and left screw threads .formed on them and screwing into the dashpot heads, and means for simultaneously rotating said rods to move the heads toward or from each other.

8. In a compound engine, reversing mechanism comprising an oscillating valve-actuating link pivoted on rock-levers H, and actuated by a moving part of the engine, in comf bination with independently-movable linkblocks movable in said links and moved by them, said link-blocks being connected to the valves of the high. and low pressure cylinders, lever-arms L2, L3, M2, M3, pivoted on the same center as the rock-levers H, and connected tothe link-blocks oscillating reversing-levers N N connecting-rods L4 M4, connecting the lever-arms L3 M3, with the reversing-levers, said rods being radially ad- Y i justab e in their connection with the reversing-levers so as to independently adjust the IOO link-blocks, and means for oscillating the reversing-l evers.

9. In a compound engine, reversing mech- 1f anism comprising an oscillating valve-actuating link pivotedon rock-levers H, and actuated by a'moving part of the engine, in combination with independently movable link-blocks movable in said links and moved by them, said link-blocks being connected to the valves of the high and low pressure cylinders, lever-arms L2, L3, M2, M3, pivoted on the same center as the rock-levers H, and

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connectedv to the link-blocks oscillating reversing-levers N, N', connecting-rods L4, M4, connectin j reversingevers, said rods being radially adjustable in their connection with the reversing-levers so as to independently adjust the link-blocks, means for oscillating the revers- .ing-levers, and adjustable stops for-regulating their range of movement. 'y

eUs'rAv BERNHARD rETscHE. Witnesses:

ARNOLD KATZ, D. STEWART.

the lever-arms L3, M3, with the 

